package cn.tedu;

import java.sql.*;
import java.util.Scanner;

public class Demo09 {
    public static void main(String[] args) {
        Scanner scanner= new Scanner(System.in);
        System.out.println("请输入用户名");
        String username = scanner.nextLine();
        System.out.println("请输入密码");
        String password= scanner.nextLine();
        System.out.println("请输入昵称");
        String nick= scanner.nextLine();

        try(Connection conn= DBUtils.getConn();

        ) {
            String sql="select id from user where username=?";
            PreparedStatement ps=conn.prepareStatement(sql);
            ps.setString(1,username);
            ResultSet rs=ps.executeQuery();
            if (rs.next()){
                System.out.println("用户名已存在");
                return;
            }
            //执行插入数据的SQl
            String insertSql = "insert into user values(null,?,?,?)";
            PreparedStatement insertPs=conn.prepareStatement(insertSql);
            insertPs.setString(1,username);
            insertPs.setString(2,password);
            insertPs.setString(3,nick);
            insertPs.executeUpdate();
            System.out.println("注册成功");
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}
